SKATES SPENSER (Chief Executive Officer) sold 4.91K shares of AMPLITUDE, INC. on the open market

Open‑market sale worth $71.0K. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 2 sales

SKATES SPENSER

Filed: 10/2/2026ACC: 0001610717-26-000424

InsiderSKATES SPENSERCIK 1882913

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IssuerAMPLITUDE, INC.CIK 1866692

DirectorOfficer· Chief Executive Officer

Since Sep 2021

-4.91K

Net shares

Net seller

$71.0K

Total sold

Open market trades

0B · 2S

Total transactions

4.91K acquired · 9.83K disposed

Non-Derivative Transactions4

Class A Common Stock

Indirect

C · Conversion

+1.37K

Price / share

—

Trade value

—

% of position

New position

9/30/2026

0.00→1.37K

Class A Common Stock

Indirect

S · Sale

−1.37K

Price / share

$14.45

Trade value

$19.86K

% of position

New position

9/30/2026

1.37K→0.00

Class A Common Stock

Indirect

C · Conversion

+3.54K

Price / share

—

Trade value

—

% of position

New position

10/1/2026

0.00→3.54K

Class A Common Stock

Indirect

S · Sale

−3.54K

Price / share

$14.45

Trade value

$51.14K

% of position

New position

10/1/2026

3.54K→0.00

Total

Net shares

+0.00

Net value

-$71K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Indirect	9/30/2026	C · Conversion	+1.37K	—	—	New position	0.00	1.37K
Class A Common Stock Indirect	9/30/2026	S · Sale	−1.37K	$14.45	$19.86K	New position	1.37K	0.00
Class A Common Stock Indirect	10/1/2026	C · Conversion	+3.54K	—	—	New position	0.00	3.54K
Class A Common Stock Indirect	10/1/2026	S · Sale	−3.54K	$14.45	$51.14K	New position	3.54K	0.00
Total			+0.00		-$71K

Derivative Transactions2

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

1.37K shares

−1.37K

Strike price

Held after

380.78K

Exercisable

—

9/30/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

3.54K shares

−3.54K

Strike price

Held after

377.24K

Exercisable

—

10/1/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Class B Common Stock Indirect	Class A Common Stock1.37K shares	9/30/2026	C · Conversion	−1.37K		—	380.78K
Class B Common Stock Indirect	Class A Common Stock3.54K shares	10/1/2026	C · Conversion	−3.54K		—	377.24K

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)1

Class B Common Stock

Direct

Underlying security

Class A Common Stock

Underlying shares

5.34M

Shares owned

5.34M

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

5.34M

Owned

5.34M

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Class B Common Stock Direct	Class A Common Stock		—	—	5.34M	5.34M
Total					5.34M	5.34M